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You use an empty, reserved slot for a global spell, and when you call it, you launch a message with variables - it's all very simple ;) For displaying loyalty, by the way ;) If you need the code, I'll post it upon request.
Added 2 minutes ago
I'm conservative when it comes to changing the game.
Added 2 minutes ago
you can't fix the interface with scripts - it doesn't support icons, words, or variables. Oh well!
I experimented with the creature interface, not the hero's - but it's the same.